'N' Habitat: Belltown, a modular apartment building under construction at 3rd Avenue and Bell Street, is shown in this artist's rendering.

Photo: Daly Partners

'N' Habitat: Belltown, a modular apartment building under...

The living room of a model unit for 'N' Habitat: Belltown, a modular apartment building under construction at 3rd Avenue and Bell Street, is shown on Tuesday, Aug. 20, 2013.

Photo: Aubrey Cohen, Seattlepi.com

The living room of a model unit for 'N' Habitat: Belltown, a...

The foldaway bed of a model unit for 'N' Habitat: Belltown, a modular apartment building under construction at 3rd Avenue and Bell Street, is shown on Tuesday, Aug. 20, 2013.
Photo: Aubrey Cohen, Seattlepi.com

The foldaway bed of a model unit for 'N' Habitat: Belltown, a...

The kitchen of a model unit for 'N' Habitat: Belltown, a modular apartment building under construction at 3rd Avenue and Bell Street, is shown on Tuesday, Aug. 20, 2013.
Photo: Aubrey Cohen, Seattlepi.com

The kitchen of a model unit for 'N' Habitat: Belltown, a modular...

The kitchen of a model unit for 'N' Habitat: Belltown, a modular apartment building under construction at 3rd Avenue and Bell Street, is shown on Tuesday, Aug. 20, 2013.
Photo: Aubrey Cohen, Seattlepi.com

The kitchen of a model unit for 'N' Habitat: Belltown, a modular...

The entry of a model unit for 'N' Habitat: Belltown, a modular apartment building under construction at 3rd Avenue and Bell Street, is shown on Tuesday, Aug. 20, 2013.
Photo: Aubrey Cohen, Seattlepi.com

The entry of a model unit for 'N' Habitat: Belltown, a modular...

The bathroom of a model unit for 'N' Habitat: Belltown, a modular apartment building under construction at 3rd Avenue and Bell Street, is shown on Tuesday, Aug. 20, 2013.
Photo: Aubrey Cohen, Seattlepi.com

The bathroom of a model unit for 'N' Habitat: Belltown, a modular...

The exterior of a model unit for 'N' Habitat: Belltown, a modular apartment building under construction at 3rd Avenue and Bell Street, is shown on Tuesday, Aug. 20, 2013.
Photo: Aubrey Cohen, Seattlepi.com

The first apartments of a 49-unit Belltown building arrived by truck this past weekend and were craned into place.

OneBuild assembled the apartments in its a factory in Klamath Falls, Ore. while workers built the base of the 'N' Habitat: Belltown building on site, at 2217 Third Ave. When the units arrived, they were complete with plumbing, wiring, fixtures, cabinets, appliances and floor coverings.

Building the units in a factory is faster and more efficient than conventional construction, and eliminates weather uncertainty, according to OneBuild. Each unit takes 10 to 11 days to build. All told, construction is scheduled take six to seven months, half the time of a conventional building.

The first apartments were originally set to arrive last month, but a wind storm delayed things. The rest of the units are scheduled to go in this coming weekend.